A Cross-Layer Design for mobile AD HOC Networking in Fast Fading Channels

In this paper, we propose a novel cross-layer design for mobile-to-mobile ad hoc networks. Our scheme makes use of the statistical characteristics of the fast fading channel and cross-layer concept to combat Rayleigh fast fading and improve radio channel utilization. A linear minimum mean square error (LMMSE) estimator employs past channel autocorrelation data to estimate the future fading status at the physical layer. The predicted channel status information (CSI) (SNR and average fading duration) is fed into the routing layer. The cross-layer architecture allows the routing layer to improve its decisions by sharing the physical layer knowledge. The proposed routing protocol EAOMDV (Extended AOMDV), which is an integration of the Ad Hoc On-Demand Multipath Distance Vector (AOMDV) routing protocol with CSI and handoff, selects the shortest stable route to improve the link quality. Contributing to the cross-layer design, each node in the network can perceive the status of other components and adapt to make the ad hoc network more adaptive and robust.